To preserve the traditions, promote the interest, and perpetuate the history of the United States Marine Corps and, by fitting acts, to observe the anniversaries of historical occasions of particular interest to Marines.

To band those who are now serving in the United States Marine Corps and those who have been honorably discharged from that Service together in fellowship, that they may effectively promote the ideals of American freedom and democracy.

To hold sacred the memory and the history of men and women who have given their lives to the nation.

To foster love for the principles that they have supported by blood and valor since the founding of the Republic.

To maintain true allegiance to American institutions.

To aid voluntarily and to render assistance to all Marines, uniformed and civilian, as well as to their surviving spouses and orphans.

League members know a special bond of comradeship unique to those who have worn the Marine Emblem. The members look after one another. They observe national holidays such as Memorial Day and Veterans Day and days of special interest to Marines such as the Marine Corps birthday, the anniversary of the flag raising at Iwo Jima and the day the Fourth Marine Brigade entered Belleau Wood.

The League performs some of its most important service on the local level through programs of benefit to the communities. Many detachments recognizing a need, embark on special programs to help advance their towns and cities.